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In my case I was looking for someone to develop dampers to be used in CS autocross class, and the amount of folks willing to do it is fairly small. Koni inserts and shocks work for most people and was my initial choice but I've read and talked to a lot of folks who have had serious issues with quality. The winning RTA WRX at nationals this last year was running stock struts in the front because they have had so many Konis break they didn't trust them to make the drive and compete on them. I looked into the new ASTs and I think someone will do it eventually since Vorschlag has built stock-compliant shocks using them in the past. Vorschlag was actually looking into Bilstein options to build a stock compliant strut and shock, but the timeframe is further in the future.
If I was just looking for regular coilovers I'd probably run the AST 4150s or the next step up. However the Penske ones can be converted to coilovers fairly easily like I mentioned above.
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